Open event on and off API

[dadiorchen]

Currently, we offer the map.on('event_name') to register a listener, now we need to open the off once API to unregister and one-time-listener, check the document here:

https://nodejs.org/api/events.html#emitteronceeventname-listener
https://nodejs.org/api/events.html#emitteroneventname-listener

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[XLPeng57]

@dadiorchen Hi, I'm new to web-map-core. Is this still an issue? If yes, could you assign it to me? I'd like to work on this! If not, are there any issues you'd recommend for me to work on?

[dadiorchen]

@XLPeng57 yes, please take this issue, I'm thinking about how to test it when you finished, any idea?

[github-actions]

🎉 This issue has been resolved in version 2.7.3 🎉

The release is available on GitHub release

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